
<template>
    <div class="login_container">
      <div class="login_box"> 
          <!-- 投向趋于-->
          <div class="avatar_box">
               <img src="../assets/logo.png"/>
          </div>
          <!--登录表单区域 :model是绑定属性单向绑定。-model:双向绑定 为表单添加Form实例引用Ref-->
    <el-form ref="loginFormRef" :model="loginForm" :rules="loginFormRules" label-width="0px" class="login_from">
        <!--用户名-->
        <el-form-item prop="username">
        <el-input v-model="loginForm.username" prefix-icon="el-icon-user-solid"></el-input>
        </el-form-item>
        <!--密码-->
        <el-form-item prop="password">
        <el-input v-model="loginForm.password"  prefix-icon="el-icon-lock" type="password"></el-input>
        </el-form-item>
        <el-form-item class="btns">
             <el-button type="primary" @click="login" >登录</el-button>
              <el-button type="info" @click="resetLoginForm">重置</el-button>
        </el-form-item>
    </el-form>
      </div>
    </div>
</template>
<script>
export default {
    data(){
        return{
            // 这是登录表单在数据绑定对象
            loginForm:{
                username:'',
                password:''
            },
              // 表单的验证规则对象
            loginFormRules:{
                // 验证用户名是否合法
                username:[
                    { required:true,message: "请输入登录名称",trigger:"blur" },
                    {min: 3, max: 10,message: "长度3-10字符",trigger:"blur" }
                ],
                // 验证密码合法性
                password:[
                    { required: true ,message: "请输入登录密码",trigger: "blur" },
                    { min: 6, max: 15,message: "长度6-15字符",trigger: "blur" }
                ]
            }
        }
    },
    methods:{
        // 点击重置按钮，重置表单
        resetLoginForm(){
           
           this.$refs.loginFormRef.resetFields();
        },
        login(){
            this.$refs.loginFormRef.validate(async valid=>{
              if(!valid) return ;
              // 发起登录请求 axios
            const { data : res } = await this.$http.post("login",this.loginForm);
            if(res.meta.status !== 200) return this.$message.error('登录失败！');
            this.$message.success('登录成功！');
            //1、将登录成功之后的token保持到客户端的sessionStorage中。
            //1.1 项目中除了登录之外的其他API接口，必须在登录之后才能访问
            //1.2 token只应在当前网站打开期间生效，所以将token保存在sessionStorage中
            window.sessionStorage.setItem('token',res.data.token);

            //2、通过编程式导航跳转到后台主页，路由地址是/home
            this.$router.push('/home');

            });
        }
    }
    
};
</script>

<style lang="less" scoped>
.login_container{
    background-color: #2b4b6b;
    height: 100%;
}

.login_box {
    width: 450px;
    height: 300px;
    background-color: #fff;
    border-radius: 3px;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%);
    .avatar_box{
        height: 130px;
        width: 130px;
        border: 1px solid #eee;
        border-radius: 50%;
        padding: 10px;
        box-shadow: 0 0 10px #ddd;
        position: absolute;
        left: 50%;
        transform: translate(-50%,-50%);
        background-color: #fff;
        img{
            width: 100%;
            height: 100%;
            border-radius: 50%;
            background-color: #eee;
        }
    }
}

.login_from{
    position: absolute;
    bottom: 0%;
    width: 100%;
    padding: 0 20% ;
    box-sizing: border-box;
}
.btns {
 display: flex;
 justify-content: flex-end;
}
</style>